Submission #387368

#	Time	Username	Problem	Language	Result	Execution time	Memory
387368		talant117408	Painting Walls (APIO20_paint)	C++17	63 / 100	1591 ms	14956 KiB

paint

#include "paint.h"
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;

#define sz(v) (int)v.size()
#define pb push_back
#define mp make_pair
#define all(v) v.begin(), v.end()

const int MAXN = 1e5+7;
int n, m, k;
int color[MAXN], can[MAXN], L[MAXN];
pii last[MAXN];
//~ int rightmost[2][MAXN];
vector <int> isLiked[MAXN];
vector <pii> dp;

int g(int i) {
	if (i >= n) return 0;
	else if (i - L[i] >= m) return 1e9;
	return 1+g(L[i]+m);
}

int minimumInstructions(int N, int M, int K, vector<int> C, vector<int> A, vector<vector<int>> B) {
	n = N; m = M; k = K;
	for (int i = 0; i < n; i++) color[i] = C[i];
	for (int i = 0; i < m; i++) {
		for (auto to : B[i]) {
			isLiked[to].pb(i);
		}
	}
	for (int i = n-1; i >= 0; i--) {
		vector <pii> curr_dp;
		vector <pii> lastest;
		for (int j = sz(isLiked[color[i]])-1; j >= 0; j--) {
			auto to = isLiked[color[i]][j];
			if (i == n-1) {
				lastest.pb(mp(i, i));
				curr_dp.pb(mp(to, i));
			}
			else {
				if (last[(to+1 >= m ? to+1-m : to+1)].first != i+1) {
					lastest.pb(mp(i, i));
					curr_dp.pb(mp(to, i));
				}
				else {
					lastest.pb(mp(i, last[(to+1 >= m ? to+1-m : to+1)].second));
					curr_dp.pb(mp(to, last[(to+1 >= m ? to+1-m : to+1)].second));
				}
			}
		}
		for (auto to : curr_dp) {
			if (to.second-i >= m-1) {
				can[i] = 1;
			}
		}
		reverse(all(lastest));
		for (int j = 0; j < sz(isLiked[color[i]]); j++) {
			last[isLiked[color[i]][j]] = lastest[j];
		}
		reverse(all(curr_dp));
		dp = curr_dp;
	}

	int prev = -1e9;
	for (int i = 0; i < n; i++) {
		if (can[i]) prev = i;
		L[i] = prev;
	}
	
	auto ans = g(0);
	return (ans >= 1e8 ? -1 : ans);
}

/*
8 3 5
3 3 1 3 4 4 2 2
3 0 1 2
2 2 3
2 3 4
*/

• Subtask 1: 12 / 12
• Subtask 2: 15 / 15
• Subtask 3: 13 / 13
• Subtask 4: 23 / 23
• Subtask 5: 0 / 37